(1) population density (2) low density forest (3) the density of a gas
density [ˈdensəti] 📢 UK📢 US
vt.使恼怒；使恶化；使加剧；
n.密度；稠密，浓厚；[物]浓度，比重；愚钝；
简而言之，总之；一句话；简言之；
adj.难以预测的；难以预料的，未定局的；怀疑的，拿不准的；不明不白；
(1) Entertains the most high hope. for the greatest endeavor. makes the worst plan. (2) But make no mistake: This cannot solely be America's endeavor. (3) Please give me enough time make every effort and allow of my endeavor and its result.
(1) The flowers give off a heady scent at night. (2) If plastic and rubber are burnt, they'll give off poisonous gases. (3) Fireflies give off flashes of light when they fly at night.
(1) Ventilate the room properly when paint stripping... (2) The pit is ventilated by a steel fan. (3) He did not think it the job of officials to ventilate their doubts or daydreams.
(1) He expected his daughters to be meek and submissive. (2) She followed him like a submissive child. (3) ‘You're right and I was wrong, ’ he said submissively.
submissive [səbˈmɪsɪv] 📢 UK📢 US
vt.释放；放开；发布；发行； n.释放，排放，解除；释放令；公映的新影片，发布的新闻[消息]；
adj.顺从的，唯命是从的；柔顺；帖；贴；
vi.黏附；附着；坚持；追随； vt.使粘附；遵循，坚持；追随，依附；
adj.无所不在的；普遍存在的；
(1) political groups agitating for social change (2) Her family are agitating to have her transferred to a prison in the UK. (3) The women who worked in these mills had begun to agitate for better conditions.
(1) particulate pollution (2) ...the particulate pollution in our atmosphere. (3) The key technology of the diesel exhaust particulate filter is filter regeneration.
(1) I'm a complete novice at skiing. (2) computer software for novices/the novice user (3) I'm a novice at these things, Lieutenant. You're the professional...
novice [ˈnɒvɪs] 📢 UK📢 US
vt.引起；创始，创作；开始，发生；发明； vi.起源于，来自；产生；起航；
adj.突出的，杰出的；突起的；著名的；荦；
n.宿醉（酒后醒来的头痛和不舒服）；遗留的感觉（或风俗、习惯等）；<医>后遗症；残余物；
n.初学者，新手；新信徒；尚未赢过大赛的赛马；
(1) She has six previous convictions for theft. (2) He plans to appeal against his conviction. (3) an offence which carries, on conviction, a sentence of not more than five years' imprisonment
conviction [kənˈvɪkʃn] 📢 UK📢 US
n.定罪；说服；确信；信念；
邻近，接界；近乎；接壤；濒；
n.窗玻璃；窗格；嵌板；方框； vt.装窗玻璃于；镶嵌板于；用染色小布片拼做（衣服）；
vt.产生；造成；引起； vi.形成；引起；
(1) The regime built up the largest army in Africa... (2) The collection has been built up over the last seventeen years... (3) Build her up with kindness and a sympathetic ear...
build up [bild ʌp] 📢 UK📢 US
adj.大量的；结实的，牢固的；重大的； n.本质；重要材料；
adj.竞争的，比赛的；（价格等）有竞争力的；（指人）好竞争的；[生化] 抑制酶作用的；
逐步建立；增进；（在某个地方）盖满了建筑物；宣扬；
在于；位于；躺在；分娩；
there is no place like home
📢 UK📢 US
vi.宣布参加竞选；当播音员； vt.宣布；述说；声称；预告；
在家千日好；
adj.闷热的，不通气的；古板的，保守的；枯燥无味的；一本正经的；
adj.分布广的；普遍的；广泛应用；普及的；
(1) ‘I'm feeling really depressed. ’ ‘The winter here has that effect sometimes. ’ (2) I tried to persuade him, but with little or no effect. (3) I can certainly feel the effects of too many late nights.
(1) Radon is known to be harmful to humans in large quantities. (2) Such chemicals taken up by plants can be harmful to humans and animals. (3) Generally speaking, natural obesity should not be harmful to human bodies.
(1) a well-ventilated room (2) The bathroom is ventilated by means of an extractor fan. (3) [不可数名词]a ventilation shaft
ventilate [ˈventɪleɪt] 📢 UK📢 US
n.不变，不变性，永恒性；
戴水肺潜水；
adj.广阔的，广大的；范围广泛的；[物]广延的；[逻]外延的；
vt.使通风；通风；公开；公开讨论；
(1) High - density plywood was used for all formed surfaces. (2) This high initial capitalization is rapidly amortized in the well managed high - density orchard. (3) This region contains areas which are prinarily covered with either high density conifers or meadow hardwoods.
high-density [hai ˈdensiti] 📢 UK📢 US
v.使复苏；使复兴；
[医]高密度；
n.二氧化碳；
n.（声音的）抑扬顿挫；节奏；韵律；调子；
(1) a global perspective (2) Try to see the issue from a different perspective . (3) a report that looks at the education system from the perspective of deaf people
perspective [pəˈspektɪv] 📢 UK📢 US
n.队列，阵列；数组；一大批；衣服； vt.排列；部署兵力；打扮，装饰；
vt.确保；担保获得[避免]；使（某人）获得；使安全；
n.透镜，望远镜；观点，看法；远景，景色；洞察力； adj.（按照）透视画法的；透视的；
v.充满；
(1) spoken/written discourse (2) discourse analysis (3) He was hoping for some lively political discourse at the meeting.
discourse [ˈdɪskɔ:s] 📢 UK📢 US
n.论述，交谈；正式的讨论； vi.演说；谈论； vt.叙述；讨论；
adj.平流层的，同温层的；
adj.沉静的，宁静的，安宁的；安详的；晴朗的；清澈的；
n.（总称）机器；（政府等的）机关，组织；机器的运转部份；机械装置；
(1) The limit for carbon monoxide is 4.5 per cent of the exhaust gas. (2) Objective To explore resistance to carbon monoxide poisonous hypoxia by Ligustrazin. (3) Others monitor methane, carbon monoxide, ozone, lead, and all sorts of particles.
carbon monoxide [ˈkɑ:bən məˈnɔkˌsaɪd] 📢 UK📢 US
adj.放射性的；
n.接近，邻近；接近度，距离；亲近；
n.一氧化碳；
adj.& adv.两手叉腰的[地]；
(1) We'll get a breath of fresh air at lunchtime. (2) Hold your breath and count to ten. (3) His breath smelt of garlic.
(1) I'd convinced myself (that) I was right. (2) I've been trying to convince him to see a doctor. (3) You'll need to convince them of your enthusiasm for the job.
(1) We address and analyze issues such as the side effect and ambiguity in Han folding. (2) If doesn't the leg get hurt what side effect does dozen of long canister gesso have? (3) Honey and what take poisonous side effect together?
side effect [said iˈfekt] 📢 UK📢 US
adj.无能力的；不胜任的；不适当的； n.无能者；不胜任者；
n.态度，立场；站姿，被放置的姿势；位置；（运动员的）始发姿势；
n.（药物等起到的）副作用；
玩得高兴，过得快活；耍笑；玩耍；
(1) peripheral information (2) Fund-raising is peripheral to their main activities. (3) the peripheral nervous system
(1) Cotton clothing allows your skin to breathe. (2) Her performance breathed wit and charm. (3) His illness is a result of breathing in paint fumes over many years.
(1) The missile fell harmlessly into the sea. (2) It's just a bit of harmless fun. (3) The bacteria are harmless to humans.
harmless [ˈhɑ:mləs] 📢 UK📢 US
n.条纹；种类；军士军阶；犯人穿的横条囚衣； vt.使带有条纹；
n.妇女连衣裙的上身，妇女紧身马甲，妇女紧身胸衣；
n.含义；含蓄，含意，言外之意；卷入，牵连，牵涉，纠缠；[逻辑学]蕴涵，蕴含；
adj.无害的，不致伤的；没有受到损失或免于法律责任的；
(1) Nothing about this sum has come to light. (2) It has come to light that he was lying. (3) The conspiracy did not come to light until a newspaper reporter noticed.
come to light [kʌm tu: lait] 📢 UK📢 US
vi.附着于，紧贴；抓紧或抱住；坚持；沿（岸）前进，贴着（墙）走； vt.依恋，依附于；
显露， 为大家所周知；东窗事发；
adj.协调的；协定的；协商好的；[乐]合拍调的；
adj.古色古香的；少见的，古怪的；离奇有趣的，；做得精巧的；
(1) a propane gas cylinder (2) ...a propane gas cylinder. (3) Combustion systems can fire on natural gas or propane.
propane [ˈprəʊpeɪn] 📢 UK📢 US
n.发起者，主办者；担保者；倡议者，提案人；后援组织； vt.赞助；
adj.自由自在的，无阻碍的；倜傥；散帻斜簪；
n.丙烷；
adv.符合语法规则地；
(1) carbon dioxide emissions are the primary source of greenhouse gases. (2) The Kyoto Protocol is a commitment to reduce the amounts of carbon dioxide output. (3) It adopts carbon dioxide protection welding . Chassis is treated through shot blast. It has and firmness.
(1) Price changes must not adversely affect the living standards of the people. (2) We commented adversely upon the imbecility of that message of telegraphic style. (3) Widely fluctuating exchange rates may adversely affect international trade.
(1) She continued her recitation of the week's events. (2) The transmission began with a recitation from the Koran. (3) The letter was short — a simple recitation of their problem.
recitation [ˌresɪˈteɪʃn] 📢 UK📢 US
迟早有用；
adj.深远的，广泛的，深至远处的；
n.车辆；交通工具；传播媒介，媒介物；[药]赋形剂；
n.朗诵；背诵；习题课；
(1) Most galaxy associations are small and have a low density contrast. (2) Flotation is a process for separating low density solids or liquid particles from a liquid phase. (3) Since density increases with the concentration of red cells, an unusually low density may indicate anemia.